If you want to do a definitive test you must:
1) note down the weather conditions (these must not change in the test)
2) Run at 1/3 speed. when you are at the maximum knots for 1/3. Ask the navigator for your maximum range. Note it down. This is "Max Range 1"
3)
i) Start at periscope depth.
ii) Run at 1/3 speed underwater until your battery is totally dead
iii) Surface and run at 1/3 on the surface until your battery is at 100%
iv) note the distance. This is the "test distance"
4) As soon as the batteries are charged run at 1/3 speed. as soon you are at the maximum knots for 1/3 ask the navigator for your maximum range. Note it down. This is "Max Range 2"
3) Run at 1/3 speed. when you are at the maximum knots for 1/3. Ask the navigator for your maximum range. Note it down. This is "Max Range 3"
4) As soon as step (3) is complete run at 1/3 for "test distance"
5) when you reach the end of "test distance" ask the navigator for your maximum range. Note it down. This is "Max Range 4"
Repeat the test at least once
It is essensial that there are no time gaps between the steps of the test.
If "Max range 1" - "Max range 2" is greater than "Max range 3" - "Max range 4" than using electrics is less efficient.
If the results are not clear than repeat the test, but do steps 3i, 3ii and 3iii twice to dubble the test distance.
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